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NAME
glGetBufferParameteriv, glGetBufferParameteri64v, glGetNamedBufferParameteriv,
glGetNamedBufferParameteri64v - return parameters of a buffer object
C SPECIFICATION
void glGetBufferParameteriv(GLenum target, GLenum value, GLint * data);
void glGetBufferParameteri64v(GLenum target, GLenum value, GLint64 * data);
void glGetNamedBufferParameteriv(GLuint buffer, GLenum pname, GLint *params);
void glGetNamedBufferParameteri64v(GLuint buffer, GLenum pname, GLint64 *params);
PARAMETERS
target
Specifies the target to which the buffer object is bound for glGetBufferParameteriv
and glGetBufferParameteri64v. Must be one of the buffer binding targets in the
following table:
┌─────────────────────────────┬────────────────────────────────┐
│Buffer Binding Target │ Purpose │
├─────────────────────────────┼────────────────────────────────┤
│GL_ARRAY_BUFFER │ Vertex attributes │
├─────────────────────────────┼────────────────────────────────┤
│GL_ATOMIC_COUNTER_BUFFER │ Atomic counter storage │
├─────────────────────────────┼────────────────────────────────┤
│GL_COPY_READ_BUFFER │ Buffer copy source │
├─────────────────────────────┼────────────────────────────────┤
│GL_COPY_WRITE_BUFFER │ Buffer copy destination │
├─────────────────────────────┼────────────────────────────────┤
│GL_DISPATCH_INDIRECT_BUFFER │ Indirect compute dispatch │
│ │ commands │
├─────────────────────────────┼────────────────────────────────┤
│GL_DRAW_INDIRECT_BUFFER │ Indirect command arguments │
├─────────────────────────────┼────────────────────────────────┤
│GL_ELEMENT_ARRAY_BUFFER │ Vertex array indices │
├─────────────────────────────┼────────────────────────────────┤
│GL_PIXEL_PACK_BUFFER │ Pixel read target │
├─────────────────────────────┼────────────────────────────────┤
│GL_PIXEL_UNPACK_BUFFER │ Texture data source │
├─────────────────────────────┼────────────────────────────────┤
│GL_QUERY_BUFFER │ Query result buffer │
├─────────────────────────────┼────────────────────────────────┤
│GL_SHADER_STORAGE_BUFFER │ Read-write storage for shaders │
├─────────────────────────────┼────────────────────────────────┤
│GL_TEXTURE_BUFFER │ Texture data buffer │
├─────────────────────────────┼────────────────────────────────┤
│GL_TRANSFORM_FEEDBACK_BUFFER │ Transform feedback buffer │
├─────────────────────────────┼────────────────────────────────┤
│GL_UNIFORM_BUFFER │ Uniform block storage │
└─────────────────────────────┴────────────────────────────────┘
buffer
Specifies the name of the buffer object for glGetNamedBufferParameteriv and
glGetNamedBufferParameteri64v.
value
Specifies the name of the buffer object parameter to query.
data
Returns the requested parameter.
DESCRIPTION
These functions return in data a selected parameter of the specified buffer object.
pname names a specific buffer object parameter, as follows:
GL_BUFFER_ACCESS
params returns the access policy set while mapping the buffer object (the value of the
access parameter enum passed to glMapBuffer). If the buffer was mapped with
glMapBufferRange, the access policy is determined by translating the bits in that
access parameter to one of the supported enums for glMapBuffer as described in the
OpenGL Specification.
GL_BUFFER_ACCESS_FLAGS
params returns the access policy set while mapping the buffer object (the value of the
access parameter bitfield passed to glMapBufferRange). If the buffer was mapped with
glMapBuffer, the access policy is determined by translating the enums in that access
parameter to the corresponding bits for glMapBufferRange as described in the OpenGL
Specification. The initial value is zero.
GL_BUFFER_IMMUTABLE_STORAGE
params returns a boolean flag indicating whether the buffer object is immutable. The
initial value is GL_FALSE.
GL_BUFFER_MAPPED
params returns a flag indicating whether the buffer object is currently mapped. The
initial value is GL_FALSE.
GL_BUFFER_MAP_LENGTH
params returns the length of the mapping into the buffer object established with
glMapBuffer*. The i64v versions of these queries should be used for this parameter.
The initial value is zero.
GL_BUFFER_MAP_OFFSET
params returns the offset of the mapping into the buffer object established with
glMapBuffer*. The i64v versions of these queries should be used for this parameter.
The initial value is zero.
GL_BUFFER_SIZE
params returns the size of the buffer object, measured in bytes. The initial value is
0.
GL_BUFFER_STORAGE_FLAGS
params returns a bitfield indicating the storage flags for the buffer object. If the
buffer object is immutable, the value returned will be that specified when the data
store was established with glBufferStorage. If the data store was established with
glBufferData, the value will be GL_MAP_READ_BIT | GL_MAP_WRITE_BIT |
GL_DYNAMIC_STORAGE_BIT | GL_MAP_WRITE_BIT. The initial value is zero.
GL_BUFFER_USAGE
params returns the buffer object's usage pattern. The initial value is GL_STATIC_DRAW.
NOTES
If an error is generated, no change is made to the contents of data.
The GL_ATOMIC_COUNTER_BUFFER target is available only if the GL version is 4.2 or greater.
The GL_DISPATCH_INDIRECT_BUFFER and GL_SHADER_STORAGE_BUFFER targets are available only if
the GL version is 4.3 or greater.
The GL_QUERY_BUFFER target is available only if the GL version is 4.4 or greater.
ERRORS
GL_INVALID_ENUM is generated by glGetBufferParameter* if target is not one of the accepted
buffer targets.
GL_INVALID_OPERATION is generated by glGetBufferParameter* if zero is bound to target.
GL_INVALID_OPERATION is generated by glGetNamedBufferParameter* if buffer is not the name
of an existing buffer object.
GL_INVALID_ENUM is generated if pname is not one of the buffer object parameter names
described above.
VERSION SUPPORT
┌──────────────────────────────┬───────────────────────────────────────────────────────────────────────┐
│ │ OpenGL Version │
├──────────────────────────────┼─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┤
│Function │ 2.0 │ 2.1 │ 3.0 │ 3.1 │ 3.2 │ 3.3 │ 4.0 │ 4.1 │ 4.2 │ 4.3 │ 4.4 │ 4.5 │
│/ │ │ │ │ │ │ │ │ │ │ │ │ │
│Feature │ │ │ │ │ │ │ │ │ │ │ │ │
│Name │ │ │ │ │ │ │ │ │ │ │ │ │
├──────────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│glGetBufferParameteri64v │ - │ - │ - │ - │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │
├──────────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│glGetBufferParameteriv │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │
├──────────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│glGetNamedBufferParameteri64v │ - │ - │ - │ - │ - │ - │ - │ - │ - │ - │ - │ ✔ │
├──────────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│glGetNamedBufferParameteriv │ - │ - │ - │ - │ - │ - │ - │ - │ - │ - │ - │ ✔ │
└──────────────────────────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘
SEE ALSO
glBindBuffer(), glBufferData(), glGetBufferPointerv(), glMapBuffer(), glUnmapBuffer()
COPYRIGHT
Copyright © 2005 Addison-Wesley. Copyright © 2010-2014 Khronos Group. This material may be
distributed subject to the terms and conditions set forth in the Open Publication License,
v 1.0, 8 June 1999. http://opencontent.org/openpub/.
COPYRIGHT
Copyright © 2005 Sams Publishing
Copyright © 2010-2014 Khronos Group
[FIXME: source] 01/03/2018 GLGETBUFFERPARAMETER(3G)